(function($) {
	// 当domReady的时候开始初始化
	$(function() {
		var $wrap = $('#uploader'),

		// 图片容器
		$queue = $('<ul class="filelist"></ul>').appendTo(
				$wrap.find('.queueList')),

		// 状态栏，包括进度和控制按钮
		$statusBar = $wrap.find('.statusBar'),

		// 文件总体选择信息。
		$info = $statusBar.find('.info'),

		// 上传按钮
		$upload = $wrap.find('.uploadBtn'),

		// 没选择文件之前的内容。
		$placeHolder = $wrap.find('.placeholder'),

		$progress = $statusBar.find('.progress').hide(),

		// 添加的文件数量
		fileCount = 0,

		// 添加的文件总大小
		fileSize = 0,

		// 优化retina, 在retina下这个值是2
		ratio = window.devicePixelRatio || 1,

		// 缩略图大小
		thumbnailWidth = 110 * ratio, thumbnailHeight = 110 * ratio,

		// 可能有pedding, ready, uploading, confirm, done.
		state = 'pedding',

		// 所有文件的进度信息，key为file id
		percentages = {},
		// 判断浏览器是否支持图片的base64
		isSupportBase64 = (function() {
			var data = new Image();
			var support = true;
			data.onload = data.onerror = function() {
				if (this.width != 1 || this.height != 1) {
					support = false;
				}
			}
			data.src = "";
			return support;
		})(),

		// 检测是否已经安装flash，检测flash的版本
		flashVersion = (function() {
			var version;

			try {
				version = navigator.plugins['Shockwave Flash'];
				version = version.description;
			} catch (ex) {
				try {
					version = new ActiveXObject('ShockwaveFlash.ShockwaveFlash')
							.GetVariable('$version');
				} catch (ex2) {
					version = '0.0';
				}
			}
			version = version.match(/\d+/g);
			return parseFloat(version[0] + '.' + version[1], 10);
		})(),

		supportTransition = (function() {
			var s = document.createElement('p').style, r = 'transition' in s
					|| 'WebkitTransition' in s || 'MozTransition' in s
					|| 'msTransition' in s || 'OTransition' in s;
			s = null;
			return r;
		})(),

		// WebUploader实例
		uploader;

		if (!WebUploader.Uploader.support('flash') && WebUploader.browser.ie) {

			// flash 安装了但是版本过低。
			if (flashVersion) {
				(function(container) {
					window['expressinstallcallback'] = function(state) {
						switch (state) {
						case 'Download.Cancelled':
							alert('您取消了更新！')
							break;

						case 'Download.Failed':
							alert('安装失败')
							break;

						default:
							alert('安装已成功，请刷新！');
							break;
						}
						delete window['expressinstallcallback'];
					};

					var swf = './expressInstall.swf';
					// insert flash object
					var html = '<object type="application/'
							+ 'x-shockwave-flash" data="' + swf + '" ';

					if (WebUploader.browser.ie) {
						html += 'classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" ';
					}

					html += 'width="100%" height="100%" style="outline:0">'
							+ '<param name="movie" value="'
							+ swf
							+ '" />'
							+ '<param name="wmode" value="transparent" />'
							+ '<param name="allowscriptaccess" value="always" />'
							+ '</object>';

					container.html(html);

				})($wrap);

				// 压根就没有安转。
			} else {
				$wrap
						.html('<a href="http://www.adobe.com/go/getflashplayer" target="_blank" border="0"><img alt="get flash player" src="http://www.adobe.com/macromedia/style_guide/images/160x41_Get_Flash_Player.jpg" /></a>');
			}

			return;
		} else if (!WebUploader.Uploader.support()) {
			alert('Web Uploader 不支持您的浏览器！');
			return;
		}

		// 实例化
		uploader = WebUploader.create({
			pick : {
				id : '#filePicker',
				label : '点击选择图片'
			},
			formData : {
				uid : 123
			},
			dnd : '#dndArea',
			paste : '#uploader',
			swf : './Uploader.swf',
			chunked : false,
			chunkSize : 512 * 1024,
			server : '/index.php?p=admin&c=Inc&a=fileupload',
			// runtimeOrder: 'flash',

			// accept: {
			//     title: 'Images',
			//     extensions: 'gif,jpg,jpeg,bmp,png',
			//     mimeTypes: 'image/*'
			// },

			// 禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候，把图片打开。
			disableGlobalDnd : true,
			fileNumLimit : 300,
			fileSizeLimit : 200 * 1024 * 1024, // 200 M
			fileSingleSizeLimit : 50 * 1024 * 1024
		// 50 M
		});

		// 拖拽时不接受 js, txt 文件。
		uploader.on('dndAccept', function(items) {
			var denied = false, len = items.length, i = 0,
			// 修改js类型
			unAllowed = 'text/plain;application/javascript ';

			for (; i < len; i++) {
				// 如果在列表里面
				if (~unAllowed.indexOf(items[i].type)) {
					denied = true;
					break;
				}
			}

			return !denied;
		});

		// uploader.on('filesQueued', function() {
		//          uploader.sort(function( a, b ) {
		//              if ( a.name < b.name )
		//                return -1;
		//              if ( a.name > b.name )
		//                return 1;
		//              return 0;
		//          });
		// });

		// 添加“添加文件”的按钮，
		uploader.addButton({
			id : '#filePicker2',
			label : '继续添加'
		});

		uploader.on('ready', function() {
			window.uploader = uploader;
		});

		// 当有文件添加进来时执行，负责view的创建
		function addFile(file) {
			var $li = $('<li id="' + file.id + '">' + '<p class="title">'
					+ file.name + '</p>' + '<p class="imgWrap"></p>'
					+ '<p class="progress"><span></span></p>' + '</li>'),

			$btns = $(
					'<div class="file-panel">'
							+ '<span class="cancel">删除</span>'
							+ '<span class="rotateRight">向右旋转</span>'
							+ '<span class="rotateLeft">向左旋转</span></div>')
					.appendTo($li), $prgress = $li.find('p.progress span'), $wrap = $li
					.find('p.imgWrap'), $info = $('<p class="error"></p>'),

			showError = function(code) {
				switch (code) {
				case 'exceed_size':
					text = '文件大小超出';
					break;

				case 'interrupt':
					text = '上传暂停';
					break;

				default:
					text = '上传失败，请重试';
					break;
				}

				$info.text(text).appendTo($li);
			};

			if (file.getStatus() === 'invalid') {
				showError(file.statusText);
			} else {
				// @todo lazyload
				$wrap.text('预览中');
				uploader.makeThumb(file, function(error, src) {
					var img;

					if (error) {
						$wrap.text('不能预览');
						return;
					}

					if (isSupportBase64) {
						img = $('<img src="' + src + '">');
						$wrap.empty().append(img);
					} else {
						$.ajax('../../server/preview.php', {
							method : 'POST',
							data : src,
							dataType : 'json'
						}).done(function(response) {
							if (response.result) {
								img = $('<img src="' + response.result + '">');
								$wrap.empty().append(img);
							} else {
								$wrap.text("预览出错");
							}
						});
					}
				}, thumbnailWidth, thumbnailHeight);

				percentages[file.id] = [ file.size, 0 ];
				file.rotation = 0;
			}

			file.on('statuschange', function(cur, prev) {
				if (prev === 'progress') {
					$prgress.hide().width(0);
				} else if (prev === 'queued') {
					$li.off('mouseenter mouseleave');
					$btns.remove();
				}

				// 成功
				if (cur === 'error' || cur === 'invalid') {
					console.log(file.statusText);
					showError(file.statusText);
					percentages[file.id][1] = 1;
				} else if (cur === 'interrupt') {
					showError('interrupt');
				} else if (cur === 'queued') {
					percentages[file.id][1] = 0;
				} else if (cur === 'progress') {
					$info.remove();
					$prgress.css('display', 'block');
				} else if (cur === 'complete') {
					$li.append('<span class="success"></span>');
				}

				$li.removeClass('state-' + prev).addClass('state-' + cur);
			});

			$li.on('mouseenter', function() {
				$btns.stop().animate({
					height : 30
				});
			});

			$li.on('mouseleave', function() {
				$btns.stop().animate({
					height : 0
				});
			});

			$btns.on('click', 'span', function() {
				var index = $(this).index(), deg;

				switch (index) {
				case 0:
					uploader.removeFile(file);
					return;

				case 1:
					file.rotation += 90;
					break;

				case 2:
					file.rotation -= 90;
					break;
				}

				if (supportTransition) {
					deg = 'rotate(' + file.rotation + 'deg)';
					$wrap.css({
						'-webkit-transform' : deg,
						'-mos-transform' : deg,
						'-o-transform' : deg,
						'transform' : deg
					});
				} else {
					$wrap.css('filter',
							'progid:DXImageTransform.Microsoft.BasicImage(rotation='
									+ (~~((file.rotation / 90) % 4 + 4) % 4)
									+ ')');
					// use jquery animate to rotation
					// $({
					//     rotation: rotation
					// }).animate({
					//     rotation: file.rotation
					// }, {
					//     easing: 'linear',
					//     step: function( now ) {
					//         now = now * Math.PI / 180;

					//         var cos = Math.cos( now ),
					//             sin = Math.sin( now );

					//         $wrap.css( 'filter', "progid:DXImageTransform.Microsoft.Matrix(M11=" + cos + ",M12=" + (-sin) + ",M21=" + sin + ",M22=" + cos + ",SizingMethod='auto expand')");
					//     }
					// });
				}

			});

			$li.appendTo($queue);
		}

		// 负责view的销毁
		function removeFile(file) {
			var $li = $('#' + file.id);

			delete percentages[file.id];
			updateTotalProgress();
			$li.off().find('.file-panel').off().end().remove();
		}

		function updateTotalProgress() {
			var loaded = 0, total = 0, spans = $progress.children(), percent;

			$.each(percentages, function(k, v) {
				total += v[0];
				loaded += v[0] * v[1];
			});

			percent = total ? loaded / total : 0;

			spans.eq(0).text(Math.round(percent * 100) + '%');
			spans.eq(1).css('width', Math.round(percent * 100) + '%');
			updateStatus();
		}

		function updateStatus() {
			var text = '', stats;

			if (state === 'ready') {
				text = '选中' + fileCount + '张图片，共'
						+ WebUploader.formatSize(fileSize) + '。';
			} else if (state === 'confirm') {
				stats = uploader.getStats();
				if (stats.uploadFailNum) {
					text = '已成功上传'
							+ stats.successNum
							+ '张照片至XX相册，'
							+ stats.uploadFailNum
							+ '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片或<a class="ignore" href="#">忽略</a>'
				}

			} else {
				stats = uploader.getStats();
				text = '共' + fileCount + '张（'
						+ WebUploader.formatSize(fileSize) + '），已上传'
						+ stats.successNum + '张';

				if (stats.uploadFailNum) {
					text += '，失败' + stats.uploadFailNum + '张';
				}
			}

			$info.html(text);
		}

		function setState(val) {
			var file, stats;

			if (val === state) {
				return;
			}

			$upload.removeClass('state-' + state);
			$upload.addClass('state-' + val);
			state = val;

			switch (state) {
			case 'pedding':
				$placeHolder.removeClass('element-invisible');
				$queue.hide();
				$statusBar.addClass('element-invisible');
				uploader.refresh();
				break;

			case 'ready':
				$placeHolder.addClass('element-invisible');
				$('#filePicker2').removeClass('element-invisible');
				$queue.show();
				$statusBar.removeClass('element-invisible');
				uploader.refresh();
				break;

			case 'uploading':
				$('#filePicker2').addClass('element-invisible');
				$progress.show();
				$upload.text('暂停上传');
				break;

			case 'paused':
				$progress.show();
				$upload.text('继续上传');
				break;

			case 'confirm':
				$progress.hide();
				$('#filePicker2').removeClass('element-invisible');
				$upload.text('开始上传');

				stats = uploader.getStats();
				if (stats.successNum && !stats.uploadFailNum) {
					setState('finish');
					return;
				}
				break;
			case 'finish':
				stats = uploader.getStats();
				if (stats.successNum) {
					alert('上传成功');
				} else {
					// 没有成功的图片，重设
					state = 'done';
					location.reload();
				}
				break;
			}

			updateStatus();
		}

		uploader.onUploadProgress = function(file, percentage) {
			var $li = $('#' + file.id), $percent = $li.find('.progress span');

			$percent.css('width', percentage * 100 + '%');
			percentages[file.id][1] = percentage;
			updateTotalProgress();
		};

		uploader.onFileQueued = function(file) {
			fileCount++;
			fileSize += file.size;

			if (fileCount === 1) {
				$placeHolder.addClass('element-invisible');
				$statusBar.show();
			}

			addFile(file);
			setState('ready');
			updateTotalProgress();
		};

		uploader.onFileDequeued = function(file) {
			fileCount--;
			fileSize -= file.size;

			if (!fileCount) {
				setState('pedding');
			}

			removeFile(file);
			updateTotalProgress();

		};

		uploader.on('all', function(type) {
			var stats;
			switch (type) {
			case 'uploadFinished':
				setState('confirm');
				break;

			case 'startUpload':
				setState('uploading');
				break;

			case 'stopUpload':
				setState('paused');
				break;

			}
		});

		uploader.onError = function(code) {
			alert('Eroor: ' + code);
		};

		$upload.on('click', function() {
			if ($(this).hasClass('disabled')) {
				return false;
			}

			if (state === 'ready') {
				uploader.upload();
			} else if (state === 'paused') {
				uploader.upload();
			} else if (state === 'uploading') {
				uploader.stop();
			}
		});

		$info.on('click', '.retry', function() {
			uploader.retry();
		});

		$info.on('click', '.ignore', function() {
			alert('todo');
		});

		$upload.addClass('state-' + state);
		updateTotalProgress();
	});

})(jQuery);